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35728b82 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * 2002-10-15 Posix Clocks & timers |
4 | * by George Anzinger george@mvista.com | |
1da177e4 LT |
5 | * Copyright (C) 2002 2003 by MontaVista Software. |
6 | * | |
7 | * 2004-06-01 Fix CLOCK_REALTIME clock/timer TIMER_ABSTIME bug. | |
8 | * Copyright (C) 2004 Boris Hu | |
9 | * | |
0141de74 | 10 | * These are all the functions necessary to implement POSIX clocks & timers |
1da177e4 LT |
11 | */ |
12 | #include <linux/mm.h> | |
1da177e4 LT |
13 | #include <linux/interrupt.h> |
14 | #include <linux/slab.h> | |
15 | #include <linux/time.h> | |
97d1f15b | 16 | #include <linux/mutex.h> |
61855b6b | 17 | #include <linux/sched/task.h> |
1da177e4 | 18 | |
7c0f6ba6 | 19 | #include <linux/uaccess.h> |
1da177e4 LT |
20 | #include <linux/list.h> |
21 | #include <linux/init.h> | |
22 | #include <linux/compiler.h> | |
5ed67f05 | 23 | #include <linux/hash.h> |
0606f422 | 24 | #include <linux/posix-clock.h> |
1da177e4 LT |
25 | #include <linux/posix-timers.h> |
26 | #include <linux/syscalls.h> | |
27 | #include <linux/wait.h> | |
28 | #include <linux/workqueue.h> | |
9984de1a | 29 | #include <linux/export.h> |
5ed67f05 | 30 | #include <linux/hashtable.h> |
edbeda46 | 31 | #include <linux/compat.h> |
19b558db | 32 | #include <linux/nospec.h> |
1da177e4 | 33 | |
8b094cd0 | 34 | #include "timekeeping.h" |
bab0aae9 | 35 | #include "posix-timers.h" |
8b094cd0 | 36 | |
1da177e4 | 37 | /* |
5ed67f05 PE |
38 | * Management arrays for POSIX timers. Timers are now kept in static hash table |
39 | * with 512 entries. | |
40 | * Timer ids are allocated by local routine, which selects proper hash head by | |
41 | * key, constructed from current->signal address and per signal struct counter. | |
42 | * This keeps timer ids unique per process, but now they can intersect between | |
43 | * processes. | |
1da177e4 LT |
44 | */ |
45 | ||
46 | /* | |
47 | * Lets keep our timers in a slab cache :-) | |
48 | */ | |
e18b890b | 49 | static struct kmem_cache *posix_timers_cache; |
5ed67f05 PE |
50 | |
51 | static DEFINE_HASHTABLE(posix_timers_hashtable, 9); | |
52 | static DEFINE_SPINLOCK(hash_lock); | |
1da177e4 | 53 | |
6631fa12 TG |
54 | static const struct k_clock * const posix_clocks[]; |
55 | static const struct k_clock *clockid_to_kclock(const clockid_t id); | |
67edab48 | 56 | static const struct k_clock clock_realtime, clock_monotonic; |
6631fa12 | 57 | |
1da177e4 LT |
58 | /* |
59 | * we assume that the new SIGEV_THREAD_ID shares no bits with the other | |
60 | * SIGEV values. Here we put out an error if this assumption fails. | |
61 | */ | |
62 | #if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \ | |
63 | ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD)) | |
64 | #error "SIGEV_THREAD_ID must not share bit with other SIGEV values!" | |
65 | #endif | |
66 | ||
1da177e4 LT |
67 | /* |
68 | * The timer ID is turned into a timer address by idr_find(). | |
69 | * Verifying a valid ID consists of: | |
70 | * | |
71 | * a) checking that idr_find() returns other than -1. | |
72 | * b) checking that the timer id matches the one in the timer itself. | |
73 | * c) that the timer owner is in the callers thread group. | |
74 | */ | |
75 | ||
76 | /* | |
77 | * CLOCKs: The POSIX standard calls for a couple of clocks and allows us | |
78 | * to implement others. This structure defines the various | |
0061748d | 79 | * clocks. |
1da177e4 LT |
80 | * |
81 | * RESOLUTION: Clock resolution is used to round up timer and interval | |
82 | * times, NOT to report clock times, which are reported with as | |
83 | * much resolution as the system can muster. In some cases this | |
84 | * resolution may depend on the underlying clock hardware and | |
85 | * may not be quantifiable until run time, and only then is the | |
86 | * necessary code is written. The standard says we should say | |
87 | * something about this issue in the documentation... | |
88 | * | |
0061748d RC |
89 | * FUNCTIONS: The CLOCKs structure defines possible functions to |
90 | * handle various clock functions. | |
1da177e4 | 91 | * |
0061748d RC |
92 | * The standard POSIX timer management code assumes the |
93 | * following: 1.) The k_itimer struct (sched.h) is used for | |
94 | * the timer. 2.) The list, it_lock, it_clock, it_id and | |
95 | * it_pid fields are not modified by timer code. | |
1da177e4 LT |
96 | * |
97 | * Permissions: It is assumed that the clock_settime() function defined | |
98 | * for each clock will take care of permission checks. Some | |
99 | * clocks may be set able by any user (i.e. local process | |
100 | * clocks) others not. Currently the only set able clock we | |
101 | * have is CLOCK_REALTIME and its high res counter part, both of | |
102 | * which we beg off on and pass to do_sys_settimeofday(). | |
103 | */ | |
20f33a03 NK |
104 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags); |
105 | ||
106 | #define lock_timer(tid, flags) \ | |
107 | ({ struct k_itimer *__timr; \ | |
108 | __cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags)); \ | |
109 | __timr; \ | |
110 | }) | |
1da177e4 | 111 | |
5ed67f05 PE |
112 | static int hash(struct signal_struct *sig, unsigned int nr) |
113 | { | |
114 | return hash_32(hash32_ptr(sig) ^ nr, HASH_BITS(posix_timers_hashtable)); | |
115 | } | |
116 | ||
117 | static struct k_itimer *__posix_timers_find(struct hlist_head *head, | |
118 | struct signal_struct *sig, | |
119 | timer_t id) | |
120 | { | |
5ed67f05 PE |
121 | struct k_itimer *timer; |
122 | ||
123 | hlist_for_each_entry_rcu(timer, head, t_hash) { | |
124 | if ((timer->it_signal == sig) && (timer->it_id == id)) | |
125 | return timer; | |
126 | } | |
127 | return NULL; | |
128 | } | |
129 | ||
130 | static struct k_itimer *posix_timer_by_id(timer_t id) | |
131 | { | |
132 | struct signal_struct *sig = current->signal; | |
133 | struct hlist_head *head = &posix_timers_hashtable[hash(sig, id)]; | |
134 | ||
135 | return __posix_timers_find(head, sig, id); | |
136 | } | |
137 | ||
138 | static int posix_timer_add(struct k_itimer *timer) | |
139 | { | |
140 | struct signal_struct *sig = current->signal; | |
141 | int first_free_id = sig->posix_timer_id; | |
142 | struct hlist_head *head; | |
143 | int ret = -ENOENT; | |
144 | ||
145 | do { | |
146 | spin_lock(&hash_lock); | |
147 | head = &posix_timers_hashtable[hash(sig, sig->posix_timer_id)]; | |
148 | if (!__posix_timers_find(head, sig, sig->posix_timer_id)) { | |
149 | hlist_add_head_rcu(&timer->t_hash, head); | |
150 | ret = sig->posix_timer_id; | |
151 | } | |
152 | if (++sig->posix_timer_id < 0) | |
153 | sig->posix_timer_id = 0; | |
154 | if ((sig->posix_timer_id == first_free_id) && (ret == -ENOENT)) | |
155 | /* Loop over all possible ids completed */ | |
156 | ret = -EAGAIN; | |
157 | spin_unlock(&hash_lock); | |
158 | } while (ret == -ENOENT); | |
159 | return ret; | |
160 | } | |
161 | ||
1da177e4 LT |
162 | static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) |
163 | { | |
164 | spin_unlock_irqrestore(&timr->it_lock, flags); | |
165 | } | |
166 | ||
42285777 | 167 | /* Get clock_realtime */ |
3c9c12f4 | 168 | static int posix_clock_realtime_get(clockid_t which_clock, struct timespec64 *tp) |
42285777 | 169 | { |
3c9c12f4 | 170 | ktime_get_real_ts64(tp); |
42285777 TG |
171 | return 0; |
172 | } | |
173 | ||
26f9a479 TG |
174 | /* Set clock_realtime */ |
175 | static int posix_clock_realtime_set(const clockid_t which_clock, | |
0fe6afe3 | 176 | const struct timespec64 *tp) |
26f9a479 | 177 | { |
0fe6afe3 | 178 | return do_sys_settimeofday64(tp, NULL); |
26f9a479 TG |
179 | } |
180 | ||
f1f1d5eb | 181 | static int posix_clock_realtime_adj(const clockid_t which_clock, |
ead25417 | 182 | struct __kernel_timex *t) |
f1f1d5eb RC |
183 | { |
184 | return do_adjtimex(t); | |
185 | } | |
186 | ||
becf8b5d TG |
187 | /* |
188 | * Get monotonic time for posix timers | |
189 | */ | |
3c9c12f4 | 190 | static int posix_ktime_get_ts(clockid_t which_clock, struct timespec64 *tp) |
becf8b5d | 191 | { |
3c9c12f4 | 192 | ktime_get_ts64(tp); |
becf8b5d TG |
193 | return 0; |
194 | } | |
1da177e4 | 195 | |
2d42244a | 196 | /* |
7fdd7f89 | 197 | * Get monotonic-raw time for posix timers |
2d42244a | 198 | */ |
3c9c12f4 | 199 | static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec64 *tp) |
2d42244a | 200 | { |
58a10456 | 201 | ktime_get_raw_ts64(tp); |
2d42244a JS |
202 | return 0; |
203 | } | |
204 | ||
da15cfda | 205 | |
3c9c12f4 | 206 | static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec64 *tp) |
da15cfda | 207 | { |
58a10456 | 208 | ktime_get_coarse_real_ts64(tp); |
da15cfda JS |
209 | return 0; |
210 | } | |
211 | ||
212 | static int posix_get_monotonic_coarse(clockid_t which_clock, | |
3c9c12f4 | 213 | struct timespec64 *tp) |
da15cfda | 214 | { |
58a10456 | 215 | ktime_get_coarse_ts64(tp); |
da15cfda JS |
216 | return 0; |
217 | } | |
218 | ||
d2e3e0ca | 219 | static int posix_get_coarse_res(const clockid_t which_clock, struct timespec64 *tp) |
da15cfda | 220 | { |
d2e3e0ca | 221 | *tp = ktime_to_timespec64(KTIME_LOW_RES); |
da15cfda JS |
222 | return 0; |
223 | } | |
7fdd7f89 | 224 | |
a3ed0e43 | 225 | static int posix_get_boottime(const clockid_t which_clock, struct timespec64 *tp) |
7fdd7f89 | 226 | { |
58a10456 | 227 | ktime_get_boottime_ts64(tp); |
7fdd7f89 JS |
228 | return 0; |
229 | } | |
230 | ||
a3ed0e43 | 231 | static int posix_get_tai(clockid_t which_clock, struct timespec64 *tp) |
1ff3c967 | 232 | { |
58a10456 | 233 | ktime_get_clocktai_ts64(tp); |
1ff3c967 JS |
234 | return 0; |
235 | } | |
7fdd7f89 | 236 | |
d2e3e0ca | 237 | static int posix_get_hrtimer_res(clockid_t which_clock, struct timespec64 *tp) |
056a3cac TG |
238 | { |
239 | tp->tv_sec = 0; | |
240 | tp->tv_nsec = hrtimer_resolution; | |
241 | return 0; | |
242 | } | |
243 | ||
1da177e4 LT |
244 | /* |
245 | * Initialize everything, well, just everything in Posix clocks/timers ;) | |
246 | */ | |
247 | static __init int init_posix_timers(void) | |
248 | { | |
1da177e4 | 249 | posix_timers_cache = kmem_cache_create("posix_timers_cache", |
040b5c6f AD |
250 | sizeof (struct k_itimer), 0, SLAB_PANIC, |
251 | NULL); | |
1da177e4 LT |
252 | return 0; |
253 | } | |
1da177e4 LT |
254 | __initcall(init_posix_timers); |
255 | ||
78c9c4df TG |
256 | /* |
257 | * The siginfo si_overrun field and the return value of timer_getoverrun(2) | |
258 | * are of type int. Clamp the overrun value to INT_MAX | |
259 | */ | |
260 | static inline int timer_overrun_to_int(struct k_itimer *timr, int baseval) | |
261 | { | |
262 | s64 sum = timr->it_overrun_last + (s64)baseval; | |
263 | ||
264 | return sum > (s64)INT_MAX ? INT_MAX : (int)sum; | |
265 | } | |
266 | ||
f37fb0aa | 267 | static void common_hrtimer_rearm(struct k_itimer *timr) |
1da177e4 | 268 | { |
44f21475 RZ |
269 | struct hrtimer *timer = &timr->it.real.timer; |
270 | ||
78c9c4df TG |
271 | timr->it_overrun += hrtimer_forward(timer, timer->base->get_time(), |
272 | timr->it_interval); | |
44f21475 | 273 | hrtimer_restart(timer); |
1da177e4 LT |
274 | } |
275 | ||
276 | /* | |
277 | * This function is exported for use by the signal deliver code. It is | |
278 | * called just prior to the info block being released and passes that | |
279 | * block to us. It's function is to update the overrun entry AND to | |
280 | * restart the timer. It should only be called if the timer is to be | |
281 | * restarted (i.e. we have flagged this in the sys_private entry of the | |
282 | * info block). | |
283 | * | |
25985edc | 284 | * To protect against the timer going away while the interrupt is queued, |
1da177e4 LT |
285 | * we require that the it_requeue_pending flag be set. |
286 | */ | |
ae7795bc | 287 | void posixtimer_rearm(struct kernel_siginfo *info) |
1da177e4 LT |
288 | { |
289 | struct k_itimer *timr; | |
290 | unsigned long flags; | |
291 | ||
292 | timr = lock_timer(info->si_tid, &flags); | |
af888d67 TG |
293 | if (!timr) |
294 | return; | |
1da177e4 | 295 | |
0e334db6 | 296 | if (timr->it_interval && timr->it_requeue_pending == info->si_sys_private) { |
f37fb0aa | 297 | timr->kclock->timer_rearm(timr); |
1da177e4 | 298 | |
21e55c1f | 299 | timr->it_active = 1; |
af888d67 | 300 | timr->it_overrun_last = timr->it_overrun; |
78c9c4df | 301 | timr->it_overrun = -1LL; |
af888d67 TG |
302 | ++timr->it_requeue_pending; |
303 | ||
78c9c4df | 304 | info->si_overrun = timer_overrun_to_int(timr, info->si_overrun); |
becf8b5d TG |
305 | } |
306 | ||
af888d67 | 307 | unlock_timer(timr, flags); |
1da177e4 LT |
308 | } |
309 | ||
ba661292 | 310 | int posix_timer_event(struct k_itimer *timr, int si_private) |
1da177e4 | 311 | { |
24122c7f EB |
312 | enum pid_type type; |
313 | int ret = -1; | |
ba661292 ON |
314 | /* |
315 | * FIXME: if ->sigq is queued we can race with | |
96fe3b07 | 316 | * dequeue_signal()->posixtimer_rearm(). |
ba661292 ON |
317 | * |
318 | * If dequeue_signal() sees the "right" value of | |
96fe3b07 | 319 | * si_sys_private it calls posixtimer_rearm(). |
ba661292 | 320 | * We re-queue ->sigq and drop ->it_lock(). |
96fe3b07 | 321 | * posixtimer_rearm() locks the timer |
ba661292 ON |
322 | * and re-schedules it while ->sigq is pending. |
323 | * Not really bad, but not that we want. | |
324 | */ | |
1da177e4 | 325 | timr->sigq->info.si_sys_private = si_private; |
1da177e4 | 326 | |
24122c7f EB |
327 | type = !(timr->it_sigev_notify & SIGEV_THREAD_ID) ? PIDTYPE_TGID : PIDTYPE_PID; |
328 | ret = send_sigqueue(timr->sigq, timr->it_pid, type); | |
4aa73611 ON |
329 | /* If we failed to send the signal the timer stops. */ |
330 | return ret > 0; | |
1da177e4 | 331 | } |
1da177e4 LT |
332 | |
333 | /* | |
334 | * This function gets called when a POSIX.1b interval timer expires. It | |
335 | * is used as a callback from the kernel internal timer. The | |
336 | * run_timer_list code ALWAYS calls with interrupts on. | |
337 | ||
338 | * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. | |
339 | */ | |
c9cb2e3d | 340 | static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) |
1da177e4 | 341 | { |
05cfb614 | 342 | struct k_itimer *timr; |
1da177e4 | 343 | unsigned long flags; |
becf8b5d | 344 | int si_private = 0; |
c9cb2e3d | 345 | enum hrtimer_restart ret = HRTIMER_NORESTART; |
1da177e4 | 346 | |
05cfb614 | 347 | timr = container_of(timer, struct k_itimer, it.real.timer); |
1da177e4 | 348 | spin_lock_irqsave(&timr->it_lock, flags); |
1da177e4 | 349 | |
21e55c1f | 350 | timr->it_active = 0; |
80105cd0 | 351 | if (timr->it_interval != 0) |
becf8b5d | 352 | si_private = ++timr->it_requeue_pending; |
1da177e4 | 353 | |
becf8b5d TG |
354 | if (posix_timer_event(timr, si_private)) { |
355 | /* | |
356 | * signal was not sent because of sig_ignor | |
357 | * we will not get a call back to restart it AND | |
358 | * it should be restarted. | |
359 | */ | |
80105cd0 | 360 | if (timr->it_interval != 0) { |
58229a18 TG |
361 | ktime_t now = hrtimer_cb_get_time(timer); |
362 | ||
363 | /* | |
364 | * FIXME: What we really want, is to stop this | |
365 | * timer completely and restart it in case the | |
366 | * SIG_IGN is removed. This is a non trivial | |
367 | * change which involves sighand locking | |
368 | * (sigh !), which we don't want to do late in | |
369 | * the release cycle. | |
370 | * | |
371 | * For now we just let timers with an interval | |
372 | * less than a jiffie expire every jiffie to | |
373 | * avoid softirq starvation in case of SIG_IGN | |
374 | * and a very small interval, which would put | |
375 | * the timer right back on the softirq pending | |
376 | * list. By moving now ahead of time we trick | |
377 | * hrtimer_forward() to expire the timer | |
378 | * later, while we still maintain the overrun | |
379 | * accuracy, but have some inconsistency in | |
380 | * the timer_gettime() case. This is at least | |
381 | * better than a starved softirq. A more | |
382 | * complex fix which solves also another related | |
383 | * inconsistency is already in the pipeline. | |
384 | */ | |
385 | #ifdef CONFIG_HIGH_RES_TIMERS | |
386 | { | |
8b0e1953 | 387 | ktime_t kj = NSEC_PER_SEC / HZ; |
58229a18 | 388 | |
80105cd0 | 389 | if (timr->it_interval < kj) |
58229a18 TG |
390 | now = ktime_add(now, kj); |
391 | } | |
392 | #endif | |
78c9c4df TG |
393 | timr->it_overrun += hrtimer_forward(timer, now, |
394 | timr->it_interval); | |
becf8b5d | 395 | ret = HRTIMER_RESTART; |
a0a0c28c | 396 | ++timr->it_requeue_pending; |
21e55c1f | 397 | timr->it_active = 1; |
1da177e4 | 398 | } |
1da177e4 | 399 | } |
1da177e4 | 400 | |
becf8b5d TG |
401 | unlock_timer(timr, flags); |
402 | return ret; | |
403 | } | |
1da177e4 | 404 | |
27af4245 | 405 | static struct pid *good_sigevent(sigevent_t * event) |
1da177e4 | 406 | { |
2118e1f5 EB |
407 | struct pid *pid = task_tgid(current); |
408 | struct task_struct *rtn; | |
1da177e4 | 409 | |
cef31d9a TG |
410 | switch (event->sigev_notify) { |
411 | case SIGEV_SIGNAL | SIGEV_THREAD_ID: | |
2118e1f5 EB |
412 | pid = find_vpid(event->sigev_notify_thread_id); |
413 | rtn = pid_task(pid, PIDTYPE_PID); | |
cef31d9a TG |
414 | if (!rtn || !same_thread_group(rtn, current)) |
415 | return NULL; | |
416 | /* FALLTHRU */ | |
417 | case SIGEV_SIGNAL: | |
418 | case SIGEV_THREAD: | |
419 | if (event->sigev_signo <= 0 || event->sigev_signo > SIGRTMAX) | |
420 | return NULL; | |
421 | /* FALLTHRU */ | |
422 | case SIGEV_NONE: | |
2118e1f5 | 423 | return pid; |
cef31d9a | 424 | default: |
1da177e4 | 425 | return NULL; |
cef31d9a | 426 | } |
1da177e4 LT |
427 | } |
428 | ||
1da177e4 LT |
429 | static struct k_itimer * alloc_posix_timer(void) |
430 | { | |
431 | struct k_itimer *tmr; | |
c3762229 | 432 | tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); |
1da177e4 LT |
433 | if (!tmr) |
434 | return tmr; | |
1da177e4 LT |
435 | if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { |
436 | kmem_cache_free(posix_timers_cache, tmr); | |
aa94fbd5 | 437 | return NULL; |
1da177e4 | 438 | } |
3b10db2b | 439 | clear_siginfo(&tmr->sigq->info); |
1da177e4 LT |
440 | return tmr; |
441 | } | |
442 | ||
8af08871 ED |
443 | static void k_itimer_rcu_free(struct rcu_head *head) |
444 | { | |
5d99b32a | 445 | struct k_itimer *tmr = container_of(head, struct k_itimer, rcu); |
8af08871 ED |
446 | |
447 | kmem_cache_free(posix_timers_cache, tmr); | |
448 | } | |
449 | ||
1da177e4 LT |
450 | #define IT_ID_SET 1 |
451 | #define IT_ID_NOT_SET 0 | |
452 | static void release_posix_timer(struct k_itimer *tmr, int it_id_set) | |
453 | { | |
454 | if (it_id_set) { | |
455 | unsigned long flags; | |
5ed67f05 PE |
456 | spin_lock_irqsave(&hash_lock, flags); |
457 | hlist_del_rcu(&tmr->t_hash); | |
458 | spin_unlock_irqrestore(&hash_lock, flags); | |
1da177e4 | 459 | } |
89992102 | 460 | put_pid(tmr->it_pid); |
1da177e4 | 461 | sigqueue_free(tmr->sigq); |
5d99b32a | 462 | call_rcu(&tmr->rcu, k_itimer_rcu_free); |
1da177e4 LT |
463 | } |
464 | ||
838394fb TG |
465 | static int common_timer_create(struct k_itimer *new_timer) |
466 | { | |
467 | hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); | |
468 | return 0; | |
469 | } | |
470 | ||
1da177e4 | 471 | /* Create a POSIX.1b interval timer. */ |
2482097c AV |
472 | static int do_timer_create(clockid_t which_clock, struct sigevent *event, |
473 | timer_t __user *created_timer_id) | |
1da177e4 | 474 | { |
d3ba5a9a | 475 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
2cd499e3 | 476 | struct k_itimer *new_timer; |
ef864c95 | 477 | int error, new_timer_id; |
1da177e4 LT |
478 | int it_id_set = IT_ID_NOT_SET; |
479 | ||
838394fb | 480 | if (!kc) |
1da177e4 | 481 | return -EINVAL; |
838394fb TG |
482 | if (!kc->timer_create) |
483 | return -EOPNOTSUPP; | |
1da177e4 LT |
484 | |
485 | new_timer = alloc_posix_timer(); | |
486 | if (unlikely(!new_timer)) | |
487 | return -EAGAIN; | |
488 | ||
489 | spin_lock_init(&new_timer->it_lock); | |
5ed67f05 PE |
490 | new_timer_id = posix_timer_add(new_timer); |
491 | if (new_timer_id < 0) { | |
492 | error = new_timer_id; | |
1da177e4 LT |
493 | goto out; |
494 | } | |
495 | ||
496 | it_id_set = IT_ID_SET; | |
497 | new_timer->it_id = (timer_t) new_timer_id; | |
498 | new_timer->it_clock = which_clock; | |
d97bb75d | 499 | new_timer->kclock = kc; |
78c9c4df | 500 | new_timer->it_overrun = -1LL; |
1da177e4 | 501 | |
2482097c | 502 | if (event) { |
36b2f046 | 503 | rcu_read_lock(); |
2482097c | 504 | new_timer->it_pid = get_pid(good_sigevent(event)); |
36b2f046 | 505 | rcu_read_unlock(); |
89992102 | 506 | if (!new_timer->it_pid) { |
1da177e4 LT |
507 | error = -EINVAL; |
508 | goto out; | |
509 | } | |
2482097c AV |
510 | new_timer->it_sigev_notify = event->sigev_notify; |
511 | new_timer->sigq->info.si_signo = event->sigev_signo; | |
512 | new_timer->sigq->info.si_value = event->sigev_value; | |
1da177e4 | 513 | } else { |
2482097c AV |
514 | new_timer->it_sigev_notify = SIGEV_SIGNAL; |
515 | new_timer->sigq->info.si_signo = SIGALRM; | |
516 | memset(&new_timer->sigq->info.si_value, 0, sizeof(sigval_t)); | |
517 | new_timer->sigq->info.si_value.sival_int = new_timer->it_id; | |
89992102 | 518 | new_timer->it_pid = get_pid(task_tgid(current)); |
1da177e4 LT |
519 | } |
520 | ||
717835d9 | 521 | new_timer->sigq->info.si_tid = new_timer->it_id; |
5a9fa730 | 522 | new_timer->sigq->info.si_code = SI_TIMER; |
717835d9 | 523 | |
2b08de00 AV |
524 | if (copy_to_user(created_timer_id, |
525 | &new_timer_id, sizeof (new_timer_id))) { | |
526 | error = -EFAULT; | |
527 | goto out; | |
528 | } | |
529 | ||
838394fb | 530 | error = kc->timer_create(new_timer); |
45e0fffc AV |
531 | if (error) |
532 | goto out; | |
533 | ||
36b2f046 | 534 | spin_lock_irq(¤t->sighand->siglock); |
27af4245 | 535 | new_timer->it_signal = current->signal; |
36b2f046 ON |
536 | list_add(&new_timer->list, ¤t->signal->posix_timers); |
537 | spin_unlock_irq(¤t->sighand->siglock); | |
ef864c95 ON |
538 | |
539 | return 0; | |
838394fb | 540 | /* |
1da177e4 LT |
541 | * In the case of the timer belonging to another task, after |
542 | * the task is unlocked, the timer is owned by the other task | |
543 | * and may cease to exist at any time. Don't use or modify | |
544 | * new_timer after the unlock call. | |
545 | */ | |
1da177e4 | 546 | out: |
ef864c95 | 547 | release_posix_timer(new_timer, it_id_set); |
1da177e4 LT |
548 | return error; |
549 | } | |
550 | ||
2482097c AV |
551 | SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, |
552 | struct sigevent __user *, timer_event_spec, | |
553 | timer_t __user *, created_timer_id) | |
554 | { | |
555 | if (timer_event_spec) { | |
556 | sigevent_t event; | |
557 | ||
558 | if (copy_from_user(&event, timer_event_spec, sizeof (event))) | |
559 | return -EFAULT; | |
560 | return do_timer_create(which_clock, &event, created_timer_id); | |
561 | } | |
562 | return do_timer_create(which_clock, NULL, created_timer_id); | |
563 | } | |
564 | ||
565 | #ifdef CONFIG_COMPAT | |
566 | COMPAT_SYSCALL_DEFINE3(timer_create, clockid_t, which_clock, | |
567 | struct compat_sigevent __user *, timer_event_spec, | |
568 | timer_t __user *, created_timer_id) | |
569 | { | |
570 | if (timer_event_spec) { | |
571 | sigevent_t event; | |
572 | ||
573 | if (get_compat_sigevent(&event, timer_event_spec)) | |
574 | return -EFAULT; | |
575 | return do_timer_create(which_clock, &event, created_timer_id); | |
576 | } | |
577 | return do_timer_create(which_clock, NULL, created_timer_id); | |
578 | } | |
579 | #endif | |
580 | ||
1da177e4 LT |
581 | /* |
582 | * Locking issues: We need to protect the result of the id look up until | |
583 | * we get the timer locked down so it is not deleted under us. The | |
584 | * removal is done under the idr spinlock so we use that here to bridge | |
585 | * the find to the timer lock. To avoid a dead lock, the timer id MUST | |
586 | * be release with out holding the timer lock. | |
587 | */ | |
20f33a03 | 588 | static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags) |
1da177e4 LT |
589 | { |
590 | struct k_itimer *timr; | |
8af08871 | 591 | |
e182bb38 TH |
592 | /* |
593 | * timer_t could be any type >= int and we want to make sure any | |
594 | * @timer_id outside positive int range fails lookup. | |
595 | */ | |
596 | if ((unsigned long long)timer_id > INT_MAX) | |
597 | return NULL; | |
598 | ||
8af08871 | 599 | rcu_read_lock(); |
5ed67f05 | 600 | timr = posix_timer_by_id(timer_id); |
1da177e4 | 601 | if (timr) { |
8af08871 | 602 | spin_lock_irqsave(&timr->it_lock, *flags); |
89992102 | 603 | if (timr->it_signal == current->signal) { |
8af08871 | 604 | rcu_read_unlock(); |
31d92845 ON |
605 | return timr; |
606 | } | |
8af08871 | 607 | spin_unlock_irqrestore(&timr->it_lock, *flags); |
31d92845 | 608 | } |
8af08871 | 609 | rcu_read_unlock(); |
1da177e4 | 610 | |
31d92845 | 611 | return NULL; |
1da177e4 LT |
612 | } |
613 | ||
91d57bae TG |
614 | static ktime_t common_hrtimer_remaining(struct k_itimer *timr, ktime_t now) |
615 | { | |
616 | struct hrtimer *timer = &timr->it.real.timer; | |
617 | ||
618 | return __hrtimer_expires_remaining_adjusted(timer, now); | |
619 | } | |
620 | ||
6fec64e1 | 621 | static s64 common_hrtimer_forward(struct k_itimer *timr, ktime_t now) |
91d57bae TG |
622 | { |
623 | struct hrtimer *timer = &timr->it.real.timer; | |
624 | ||
6fec64e1 | 625 | return hrtimer_forward(timer, now, timr->it_interval); |
91d57bae TG |
626 | } |
627 | ||
1da177e4 LT |
628 | /* |
629 | * Get the time remaining on a POSIX.1b interval timer. This function | |
630 | * is ALWAYS called with spin_lock_irq on the timer, thus it must not | |
631 | * mess with irq. | |
632 | * | |
633 | * We have a couple of messes to clean up here. First there is the case | |
634 | * of a timer that has a requeue pending. These timers should appear to | |
635 | * be in the timer list with an expiry as if we were to requeue them | |
636 | * now. | |
637 | * | |
638 | * The second issue is the SIGEV_NONE timer which may be active but is | |
639 | * not really ever put in the timer list (to save system resources). | |
640 | * This timer may be expired, and if so, we will do it here. Otherwise | |
641 | * it is the same as a requeue pending timer WRT to what we should | |
642 | * report. | |
643 | */ | |
f2c45807 | 644 | void common_timer_get(struct k_itimer *timr, struct itimerspec64 *cur_setting) |
1da177e4 | 645 | { |
91d57bae | 646 | const struct k_clock *kc = timr->kclock; |
3b98a532 | 647 | ktime_t now, remaining, iv; |
91d57bae TG |
648 | struct timespec64 ts64; |
649 | bool sig_none; | |
1da177e4 | 650 | |
cef31d9a | 651 | sig_none = timr->it_sigev_notify == SIGEV_NONE; |
80105cd0 | 652 | iv = timr->it_interval; |
3b98a532 | 653 | |
becf8b5d | 654 | /* interval timer ? */ |
91d57bae | 655 | if (iv) { |
5f252b32 | 656 | cur_setting->it_interval = ktime_to_timespec64(iv); |
91d57bae TG |
657 | } else if (!timr->it_active) { |
658 | /* | |
659 | * SIGEV_NONE oneshot timers are never queued. Check them | |
660 | * below. | |
661 | */ | |
662 | if (!sig_none) | |
663 | return; | |
664 | } | |
3b98a532 | 665 | |
91d57bae TG |
666 | /* |
667 | * The timespec64 based conversion is suboptimal, but it's not | |
668 | * worth to implement yet another callback. | |
669 | */ | |
670 | kc->clock_get(timr->it_clock, &ts64); | |
671 | now = timespec64_to_ktime(ts64); | |
3b98a532 | 672 | |
becf8b5d | 673 | /* |
91d57bae TG |
674 | * When a requeue is pending or this is a SIGEV_NONE timer move the |
675 | * expiry time forward by intervals, so expiry is > now. | |
becf8b5d | 676 | */ |
91d57bae | 677 | if (iv && (timr->it_requeue_pending & REQUEUE_PENDING || sig_none)) |
78c9c4df | 678 | timr->it_overrun += kc->timer_forward(timr, now); |
3b98a532 | 679 | |
91d57bae | 680 | remaining = kc->timer_remaining(timr, now); |
becf8b5d | 681 | /* Return 0 only, when the timer is expired and not pending */ |
2456e855 | 682 | if (remaining <= 0) { |
3b98a532 RZ |
683 | /* |
684 | * A single shot SIGEV_NONE timer must return 0, when | |
685 | * it is expired ! | |
686 | */ | |
91d57bae | 687 | if (!sig_none) |
3b98a532 | 688 | cur_setting->it_value.tv_nsec = 1; |
91d57bae | 689 | } else { |
5f252b32 | 690 | cur_setting->it_value = ktime_to_timespec64(remaining); |
91d57bae | 691 | } |
1da177e4 LT |
692 | } |
693 | ||
694 | /* Get the time remaining on a POSIX.1b interval timer. */ | |
b0dc1242 | 695 | static int do_timer_gettime(timer_t timer_id, struct itimerspec64 *setting) |
1da177e4 | 696 | { |
a7319fa2 | 697 | struct k_itimer *timr; |
d3ba5a9a | 698 | const struct k_clock *kc; |
1da177e4 | 699 | unsigned long flags; |
a7319fa2 | 700 | int ret = 0; |
1da177e4 LT |
701 | |
702 | timr = lock_timer(timer_id, &flags); | |
703 | if (!timr) | |
704 | return -EINVAL; | |
705 | ||
b0dc1242 | 706 | memset(setting, 0, sizeof(*setting)); |
d97bb75d | 707 | kc = timr->kclock; |
a7319fa2 TG |
708 | if (WARN_ON_ONCE(!kc || !kc->timer_get)) |
709 | ret = -EINVAL; | |
710 | else | |
b0dc1242 | 711 | kc->timer_get(timr, setting); |
1da177e4 LT |
712 | |
713 | unlock_timer(timr, flags); | |
b0dc1242 AV |
714 | return ret; |
715 | } | |
1da177e4 | 716 | |
b0dc1242 AV |
717 | /* Get the time remaining on a POSIX.1b interval timer. */ |
718 | SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, | |
6ff84735 | 719 | struct __kernel_itimerspec __user *, setting) |
b0dc1242 | 720 | { |
725816e8 | 721 | struct itimerspec64 cur_setting; |
1da177e4 | 722 | |
725816e8 | 723 | int ret = do_timer_gettime(timer_id, &cur_setting); |
b0dc1242 | 724 | if (!ret) { |
725816e8 | 725 | if (put_itimerspec64(&cur_setting, setting)) |
b0dc1242 AV |
726 | ret = -EFAULT; |
727 | } | |
a7319fa2 | 728 | return ret; |
1da177e4 | 729 | } |
becf8b5d | 730 | |
6ff84735 DD |
731 | #ifdef CONFIG_COMPAT_32BIT_TIME |
732 | ||
8dabe724 AB |
733 | SYSCALL_DEFINE2(timer_gettime32, timer_t, timer_id, |
734 | struct old_itimerspec32 __user *, setting) | |
b0dc1242 | 735 | { |
725816e8 | 736 | struct itimerspec64 cur_setting; |
b0dc1242 | 737 | |
725816e8 | 738 | int ret = do_timer_gettime(timer_id, &cur_setting); |
b0dc1242 | 739 | if (!ret) { |
9afc5eee | 740 | if (put_old_itimerspec32(&cur_setting, setting)) |
b0dc1242 AV |
741 | ret = -EFAULT; |
742 | } | |
743 | return ret; | |
744 | } | |
6ff84735 | 745 | |
b0dc1242 AV |
746 | #endif |
747 | ||
1da177e4 LT |
748 | /* |
749 | * Get the number of overruns of a POSIX.1b interval timer. This is to | |
750 | * be the overrun of the timer last delivered. At the same time we are | |
751 | * accumulating overruns on the next timer. The overrun is frozen when | |
752 | * the signal is delivered, either at the notify time (if the info block | |
753 | * is not queued) or at the actual delivery time (as we are informed by | |
96fe3b07 | 754 | * the call back to posixtimer_rearm(). So all we need to do is |
1da177e4 LT |
755 | * to pick up the frozen overrun. |
756 | */ | |
362e9c07 | 757 | SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) |
1da177e4 LT |
758 | { |
759 | struct k_itimer *timr; | |
760 | int overrun; | |
5ba25331 | 761 | unsigned long flags; |
1da177e4 LT |
762 | |
763 | timr = lock_timer(timer_id, &flags); | |
764 | if (!timr) | |
765 | return -EINVAL; | |
766 | ||
78c9c4df | 767 | overrun = timer_overrun_to_int(timr, 0); |
1da177e4 LT |
768 | unlock_timer(timr, flags); |
769 | ||
770 | return overrun; | |
771 | } | |
1da177e4 | 772 | |
eae1c4ae TG |
773 | static void common_hrtimer_arm(struct k_itimer *timr, ktime_t expires, |
774 | bool absolute, bool sigev_none) | |
775 | { | |
776 | struct hrtimer *timer = &timr->it.real.timer; | |
777 | enum hrtimer_mode mode; | |
778 | ||
779 | mode = absolute ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; | |
67edab48 TG |
780 | /* |
781 | * Posix magic: Relative CLOCK_REALTIME timers are not affected by | |
782 | * clock modifications, so they become CLOCK_MONOTONIC based under the | |
783 | * hood. See hrtimer_init(). Update timr->kclock, so the generic | |
784 | * functions which use timr->kclock->clock_get() work. | |
785 | * | |
786 | * Note: it_clock stays unmodified, because the next timer_set() might | |
787 | * use ABSTIME, so it needs to switch back. | |
788 | */ | |
789 | if (timr->it_clock == CLOCK_REALTIME) | |
790 | timr->kclock = absolute ? &clock_realtime : &clock_monotonic; | |
791 | ||
eae1c4ae TG |
792 | hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); |
793 | timr->it.real.timer.function = posix_timer_fn; | |
794 | ||
795 | if (!absolute) | |
796 | expires = ktime_add_safe(expires, timer->base->get_time()); | |
797 | hrtimer_set_expires(timer, expires); | |
798 | ||
799 | if (!sigev_none) | |
800 | hrtimer_start_expires(timer, HRTIMER_MODE_ABS); | |
801 | } | |
802 | ||
803 | static int common_hrtimer_try_to_cancel(struct k_itimer *timr) | |
804 | { | |
805 | return hrtimer_try_to_cancel(&timr->it.real.timer); | |
806 | } | |
807 | ||
ec8f954a TG |
808 | static void common_timer_wait_running(struct k_itimer *timer) |
809 | { | |
810 | hrtimer_cancel_wait_running(&timer->it.real.timer); | |
811 | } | |
812 | ||
6945e5c2 TG |
813 | static struct k_itimer *timer_wait_running(struct k_itimer *timer, |
814 | unsigned long *flags) | |
815 | { | |
ec8f954a | 816 | const struct k_clock *kc = READ_ONCE(timer->kclock); |
6945e5c2 TG |
817 | timer_t timer_id = READ_ONCE(timer->it_id); |
818 | ||
ec8f954a TG |
819 | /* Prevent kfree(timer) after dropping the lock */ |
820 | rcu_read_lock(); | |
6945e5c2 | 821 | unlock_timer(timer, *flags); |
ec8f954a TG |
822 | |
823 | if (!WARN_ON_ONCE(!kc->timer_wait_running)) | |
824 | kc->timer_wait_running(timer); | |
825 | ||
826 | rcu_read_unlock(); | |
6945e5c2 TG |
827 | /* Relock the timer. It might be not longer hashed. */ |
828 | return lock_timer(timer_id, flags); | |
829 | } | |
830 | ||
1da177e4 | 831 | /* Set a POSIX.1b interval timer. */ |
f2c45807 TG |
832 | int common_timer_set(struct k_itimer *timr, int flags, |
833 | struct itimerspec64 *new_setting, | |
834 | struct itimerspec64 *old_setting) | |
1da177e4 | 835 | { |
eae1c4ae TG |
836 | const struct k_clock *kc = timr->kclock; |
837 | bool sigev_none; | |
838 | ktime_t expires; | |
1da177e4 LT |
839 | |
840 | if (old_setting) | |
841 | common_timer_get(timr, old_setting); | |
842 | ||
eae1c4ae | 843 | /* Prevent rearming by clearing the interval */ |
80105cd0 | 844 | timr->it_interval = 0; |
1da177e4 | 845 | /* |
eae1c4ae TG |
846 | * Careful here. On SMP systems the timer expiry function could be |
847 | * active and spinning on timr->it_lock. | |
1da177e4 | 848 | */ |
eae1c4ae | 849 | if (kc->timer_try_to_cancel(timr) < 0) |
1da177e4 | 850 | return TIMER_RETRY; |
1da177e4 | 851 | |
21e55c1f TG |
852 | timr->it_active = 0; |
853 | timr->it_requeue_pending = (timr->it_requeue_pending + 2) & | |
1da177e4 LT |
854 | ~REQUEUE_PENDING; |
855 | timr->it_overrun_last = 0; | |
1da177e4 | 856 | |
eae1c4ae | 857 | /* Switch off the timer when it_value is zero */ |
becf8b5d TG |
858 | if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec) |
859 | return 0; | |
1da177e4 | 860 | |
80105cd0 | 861 | timr->it_interval = timespec64_to_ktime(new_setting->it_interval); |
eae1c4ae | 862 | expires = timespec64_to_ktime(new_setting->it_value); |
cef31d9a | 863 | sigev_none = timr->it_sigev_notify == SIGEV_NONE; |
becf8b5d | 864 | |
eae1c4ae TG |
865 | kc->timer_arm(timr, expires, flags & TIMER_ABSTIME, sigev_none); |
866 | timr->it_active = !sigev_none; | |
1da177e4 LT |
867 | return 0; |
868 | } | |
869 | ||
21670ee4 | 870 | static int do_timer_settime(timer_t timer_id, int tmr_flags, |
1acbe770 AV |
871 | struct itimerspec64 *new_spec64, |
872 | struct itimerspec64 *old_spec64) | |
1da177e4 | 873 | { |
1acbe770 | 874 | const struct k_clock *kc; |
5f252b32 | 875 | struct k_itimer *timr; |
21670ee4 | 876 | unsigned long flags; |
5f252b32 | 877 | int error = 0; |
1da177e4 | 878 | |
1acbe770 AV |
879 | if (!timespec64_valid(&new_spec64->it_interval) || |
880 | !timespec64_valid(&new_spec64->it_value)) | |
1da177e4 LT |
881 | return -EINVAL; |
882 | ||
1acbe770 AV |
883 | if (old_spec64) |
884 | memset(old_spec64, 0, sizeof(*old_spec64)); | |
6945e5c2 | 885 | |
21670ee4 | 886 | timr = lock_timer(timer_id, &flags); |
6945e5c2 | 887 | retry: |
1da177e4 LT |
888 | if (!timr) |
889 | return -EINVAL; | |
890 | ||
d97bb75d | 891 | kc = timr->kclock; |
27722df1 TG |
892 | if (WARN_ON_ONCE(!kc || !kc->timer_set)) |
893 | error = -EINVAL; | |
894 | else | |
21670ee4 | 895 | error = kc->timer_set(timr, tmr_flags, new_spec64, old_spec64); |
1da177e4 | 896 | |
1da177e4 | 897 | if (error == TIMER_RETRY) { |
6945e5c2 TG |
898 | // We already got the old time... |
899 | old_spec64 = NULL; | |
900 | /* Unlocks and relocks the timer if it still exists */ | |
901 | timr = timer_wait_running(timr, &flags); | |
1da177e4 LT |
902 | goto retry; |
903 | } | |
6945e5c2 | 904 | unlock_timer(timr, flags); |
1da177e4 | 905 | |
1acbe770 AV |
906 | return error; |
907 | } | |
1da177e4 | 908 | |
1acbe770 AV |
909 | /* Set a POSIX.1b interval timer */ |
910 | SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, | |
6ff84735 DD |
911 | const struct __kernel_itimerspec __user *, new_setting, |
912 | struct __kernel_itimerspec __user *, old_setting) | |
1acbe770 | 913 | { |
725816e8 DD |
914 | struct itimerspec64 new_spec, old_spec; |
915 | struct itimerspec64 *rtn = old_setting ? &old_spec : NULL; | |
1acbe770 AV |
916 | int error = 0; |
917 | ||
918 | if (!new_setting) | |
919 | return -EINVAL; | |
920 | ||
725816e8 | 921 | if (get_itimerspec64(&new_spec, new_setting)) |
1acbe770 | 922 | return -EFAULT; |
1acbe770 | 923 | |
725816e8 | 924 | error = do_timer_settime(timer_id, flags, &new_spec, rtn); |
1acbe770 | 925 | if (!error && old_setting) { |
725816e8 | 926 | if (put_itimerspec64(&old_spec, old_setting)) |
1acbe770 AV |
927 | error = -EFAULT; |
928 | } | |
929 | return error; | |
930 | } | |
931 | ||
6ff84735 | 932 | #ifdef CONFIG_COMPAT_32BIT_TIME |
8dabe724 AB |
933 | SYSCALL_DEFINE4(timer_settime32, timer_t, timer_id, int, flags, |
934 | struct old_itimerspec32 __user *, new, | |
935 | struct old_itimerspec32 __user *, old) | |
1acbe770 | 936 | { |
725816e8 DD |
937 | struct itimerspec64 new_spec, old_spec; |
938 | struct itimerspec64 *rtn = old ? &old_spec : NULL; | |
1acbe770 AV |
939 | int error = 0; |
940 | ||
941 | if (!new) | |
942 | return -EINVAL; | |
9afc5eee | 943 | if (get_old_itimerspec32(&new_spec, new)) |
1acbe770 AV |
944 | return -EFAULT; |
945 | ||
725816e8 | 946 | error = do_timer_settime(timer_id, flags, &new_spec, rtn); |
1acbe770 | 947 | if (!error && old) { |
9afc5eee | 948 | if (put_old_itimerspec32(&old_spec, old)) |
1acbe770 AV |
949 | error = -EFAULT; |
950 | } | |
1da177e4 LT |
951 | return error; |
952 | } | |
1acbe770 | 953 | #endif |
1da177e4 | 954 | |
f2c45807 | 955 | int common_timer_del(struct k_itimer *timer) |
1da177e4 | 956 | { |
eae1c4ae | 957 | const struct k_clock *kc = timer->kclock; |
f972be33 | 958 | |
eae1c4ae TG |
959 | timer->it_interval = 0; |
960 | if (kc->timer_try_to_cancel(timer) < 0) | |
1da177e4 | 961 | return TIMER_RETRY; |
21e55c1f | 962 | timer->it_active = 0; |
1da177e4 LT |
963 | return 0; |
964 | } | |
965 | ||
966 | static inline int timer_delete_hook(struct k_itimer *timer) | |
967 | { | |
d97bb75d | 968 | const struct k_clock *kc = timer->kclock; |
6761c670 TG |
969 | |
970 | if (WARN_ON_ONCE(!kc || !kc->timer_del)) | |
971 | return -EINVAL; | |
972 | return kc->timer_del(timer); | |
1da177e4 LT |
973 | } |
974 | ||
975 | /* Delete a POSIX.1b interval timer. */ | |
362e9c07 | 976 | SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) |
1da177e4 LT |
977 | { |
978 | struct k_itimer *timer; | |
5ba25331 | 979 | unsigned long flags; |
1da177e4 | 980 | |
1da177e4 | 981 | timer = lock_timer(timer_id, &flags); |
6945e5c2 TG |
982 | |
983 | retry_delete: | |
1da177e4 LT |
984 | if (!timer) |
985 | return -EINVAL; | |
986 | ||
6945e5c2 TG |
987 | if (unlikely(timer_delete_hook(timer) == TIMER_RETRY)) { |
988 | /* Unlocks and relocks the timer if it still exists */ | |
989 | timer = timer_wait_running(timer, &flags); | |
1da177e4 LT |
990 | goto retry_delete; |
991 | } | |
becf8b5d | 992 | |
1da177e4 LT |
993 | spin_lock(¤t->sighand->siglock); |
994 | list_del(&timer->list); | |
995 | spin_unlock(¤t->sighand->siglock); | |
996 | /* | |
997 | * This keeps any tasks waiting on the spin lock from thinking | |
998 | * they got something (see the lock code above). | |
999 | */ | |
89992102 | 1000 | timer->it_signal = NULL; |
4b7a1304 | 1001 | |
1da177e4 LT |
1002 | unlock_timer(timer, flags); |
1003 | release_posix_timer(timer, IT_ID_SET); | |
1004 | return 0; | |
1005 | } | |
becf8b5d | 1006 | |
1da177e4 LT |
1007 | /* |
1008 | * return timer owned by the process, used by exit_itimers | |
1009 | */ | |
858119e1 | 1010 | static void itimer_delete(struct k_itimer *timer) |
1da177e4 | 1011 | { |
1da177e4 | 1012 | retry_delete: |
7586addb | 1013 | spin_lock_irq(&timer->it_lock); |
1da177e4 | 1014 | |
becf8b5d | 1015 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
7586addb | 1016 | spin_unlock_irq(&timer->it_lock); |
1da177e4 LT |
1017 | goto retry_delete; |
1018 | } | |
1da177e4 | 1019 | list_del(&timer->list); |
4b7a1304 | 1020 | |
7586addb | 1021 | spin_unlock_irq(&timer->it_lock); |
1da177e4 LT |
1022 | release_posix_timer(timer, IT_ID_SET); |
1023 | } | |
1024 | ||
1025 | /* | |
25f407f0 | 1026 | * This is called by do_exit or de_thread, only when there are no more |
1da177e4 LT |
1027 | * references to the shared signal_struct. |
1028 | */ | |
1029 | void exit_itimers(struct signal_struct *sig) | |
1030 | { | |
1031 | struct k_itimer *tmr; | |
1032 | ||
1033 | while (!list_empty(&sig->posix_timers)) { | |
1034 | tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); | |
1035 | itimer_delete(tmr); | |
1036 | } | |
1037 | } | |
1038 | ||
362e9c07 | 1039 | SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, |
6d5b8413 | 1040 | const struct __kernel_timespec __user *, tp) |
1da177e4 | 1041 | { |
d3ba5a9a | 1042 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
5c499410 | 1043 | struct timespec64 new_tp; |
1da177e4 | 1044 | |
26f9a479 | 1045 | if (!kc || !kc->clock_set) |
1da177e4 | 1046 | return -EINVAL; |
26f9a479 | 1047 | |
5c499410 | 1048 | if (get_timespec64(&new_tp, tp)) |
1da177e4 LT |
1049 | return -EFAULT; |
1050 | ||
5c499410 | 1051 | return kc->clock_set(which_clock, &new_tp); |
1da177e4 LT |
1052 | } |
1053 | ||
362e9c07 | 1054 | SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, |
6d5b8413 | 1055 | struct __kernel_timespec __user *, tp) |
1da177e4 | 1056 | { |
d3ba5a9a | 1057 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
5c499410 | 1058 | struct timespec64 kernel_tp; |
1da177e4 LT |
1059 | int error; |
1060 | ||
42285777 | 1061 | if (!kc) |
1da177e4 | 1062 | return -EINVAL; |
42285777 | 1063 | |
5c499410 | 1064 | error = kc->clock_get(which_clock, &kernel_tp); |
42285777 | 1065 | |
5c499410 | 1066 | if (!error && put_timespec64(&kernel_tp, tp)) |
1da177e4 LT |
1067 | error = -EFAULT; |
1068 | ||
1069 | return error; | |
1da177e4 LT |
1070 | } |
1071 | ||
ead25417 | 1072 | int do_clock_adjtime(const clockid_t which_clock, struct __kernel_timex * ktx) |
f1f1d5eb | 1073 | { |
d3ba5a9a | 1074 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
f1f1d5eb RC |
1075 | |
1076 | if (!kc) | |
1077 | return -EINVAL; | |
1078 | if (!kc->clock_adj) | |
1079 | return -EOPNOTSUPP; | |
1080 | ||
1a596398 AB |
1081 | return kc->clock_adj(which_clock, ktx); |
1082 | } | |
1083 | ||
1084 | SYSCALL_DEFINE2(clock_adjtime, const clockid_t, which_clock, | |
3876ced4 | 1085 | struct __kernel_timex __user *, utx) |
1a596398 | 1086 | { |
ead25417 | 1087 | struct __kernel_timex ktx; |
1a596398 AB |
1088 | int err; |
1089 | ||
f1f1d5eb RC |
1090 | if (copy_from_user(&ktx, utx, sizeof(ktx))) |
1091 | return -EFAULT; | |
1092 | ||
1a596398 | 1093 | err = do_clock_adjtime(which_clock, &ktx); |
f1f1d5eb | 1094 | |
f0dbe81f | 1095 | if (err >= 0 && copy_to_user(utx, &ktx, sizeof(ktx))) |
f1f1d5eb RC |
1096 | return -EFAULT; |
1097 | ||
1098 | return err; | |
1099 | } | |
1100 | ||
d822cdcc | 1101 | SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, |
6d5b8413 | 1102 | struct __kernel_timespec __user *, tp) |
d822cdcc AV |
1103 | { |
1104 | const struct k_clock *kc = clockid_to_kclock(which_clock); | |
5c499410 | 1105 | struct timespec64 rtn_tp; |
d822cdcc AV |
1106 | int error; |
1107 | ||
1108 | if (!kc) | |
1109 | return -EINVAL; | |
1110 | ||
5c499410 | 1111 | error = kc->clock_getres(which_clock, &rtn_tp); |
d822cdcc | 1112 | |
5c499410 | 1113 | if (!error && tp && put_timespec64(&rtn_tp, tp)) |
d822cdcc AV |
1114 | error = -EFAULT; |
1115 | ||
1116 | return error; | |
1117 | } | |
1118 | ||
b5793b0d | 1119 | #ifdef CONFIG_COMPAT_32BIT_TIME |
3a4d44b6 | 1120 | |
8dabe724 AB |
1121 | SYSCALL_DEFINE2(clock_settime32, clockid_t, which_clock, |
1122 | struct old_timespec32 __user *, tp) | |
d822cdcc AV |
1123 | { |
1124 | const struct k_clock *kc = clockid_to_kclock(which_clock); | |
5c499410 | 1125 | struct timespec64 ts; |
d822cdcc AV |
1126 | |
1127 | if (!kc || !kc->clock_set) | |
1128 | return -EINVAL; | |
1129 | ||
9afc5eee | 1130 | if (get_old_timespec32(&ts, tp)) |
d822cdcc AV |
1131 | return -EFAULT; |
1132 | ||
5c499410 | 1133 | return kc->clock_set(which_clock, &ts); |
d822cdcc AV |
1134 | } |
1135 | ||
8dabe724 AB |
1136 | SYSCALL_DEFINE2(clock_gettime32, clockid_t, which_clock, |
1137 | struct old_timespec32 __user *, tp) | |
d822cdcc AV |
1138 | { |
1139 | const struct k_clock *kc = clockid_to_kclock(which_clock); | |
5c499410 DD |
1140 | struct timespec64 ts; |
1141 | int err; | |
d822cdcc AV |
1142 | |
1143 | if (!kc) | |
1144 | return -EINVAL; | |
1145 | ||
5c499410 | 1146 | err = kc->clock_get(which_clock, &ts); |
d822cdcc | 1147 | |
9afc5eee | 1148 | if (!err && put_old_timespec32(&ts, tp)) |
5c499410 | 1149 | err = -EFAULT; |
d822cdcc | 1150 | |
5c499410 | 1151 | return err; |
d822cdcc AV |
1152 | } |
1153 | ||
8dabe724 AB |
1154 | SYSCALL_DEFINE2(clock_adjtime32, clockid_t, which_clock, |
1155 | struct old_timex32 __user *, utp) | |
3a4d44b6 | 1156 | { |
ead25417 | 1157 | struct __kernel_timex ktx; |
3a4d44b6 AV |
1158 | int err; |
1159 | ||
4d5f007e | 1160 | err = get_old_timex32(&ktx, utp); |
3a4d44b6 AV |
1161 | if (err) |
1162 | return err; | |
1163 | ||
1a596398 | 1164 | err = do_clock_adjtime(which_clock, &ktx); |
3a4d44b6 AV |
1165 | |
1166 | if (err >= 0) | |
4d5f007e | 1167 | err = put_old_timex32(utp, &ktx); |
3a4d44b6 AV |
1168 | |
1169 | return err; | |
1170 | } | |
3a4d44b6 | 1171 | |
8dabe724 AB |
1172 | SYSCALL_DEFINE2(clock_getres_time32, clockid_t, which_clock, |
1173 | struct old_timespec32 __user *, tp) | |
1da177e4 | 1174 | { |
d3ba5a9a | 1175 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
5c499410 DD |
1176 | struct timespec64 ts; |
1177 | int err; | |
1da177e4 | 1178 | |
e5e542ee | 1179 | if (!kc) |
1da177e4 LT |
1180 | return -EINVAL; |
1181 | ||
5c499410 | 1182 | err = kc->clock_getres(which_clock, &ts); |
9afc5eee | 1183 | if (!err && tp && put_old_timespec32(&ts, tp)) |
5c499410 | 1184 | return -EFAULT; |
1da177e4 | 1185 | |
5c499410 | 1186 | return err; |
1da177e4 | 1187 | } |
5c499410 | 1188 | |
d822cdcc | 1189 | #endif |
1da177e4 | 1190 | |
97735f25 TG |
1191 | /* |
1192 | * nanosleep for monotonic and realtime clocks | |
1193 | */ | |
1194 | static int common_nsleep(const clockid_t which_clock, int flags, | |
938e7cf2 | 1195 | const struct timespec64 *rqtp) |
97735f25 | 1196 | { |
938e7cf2 | 1197 | return hrtimer_nanosleep(rqtp, flags & TIMER_ABSTIME ? |
080344b9 ON |
1198 | HRTIMER_MODE_ABS : HRTIMER_MODE_REL, |
1199 | which_clock); | |
97735f25 | 1200 | } |
1da177e4 | 1201 | |
362e9c07 | 1202 | SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, |
01909974 DD |
1203 | const struct __kernel_timespec __user *, rqtp, |
1204 | struct __kernel_timespec __user *, rmtp) | |
1da177e4 | 1205 | { |
d3ba5a9a | 1206 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
c0edd7c9 | 1207 | struct timespec64 t; |
1da177e4 | 1208 | |
a5cd2880 | 1209 | if (!kc) |
1da177e4 | 1210 | return -EINVAL; |
a5cd2880 | 1211 | if (!kc->nsleep) |
93cb8e20 | 1212 | return -EOPNOTSUPP; |
1da177e4 | 1213 | |
c0edd7c9 | 1214 | if (get_timespec64(&t, rqtp)) |
1da177e4 LT |
1215 | return -EFAULT; |
1216 | ||
c0edd7c9 | 1217 | if (!timespec64_valid(&t)) |
1da177e4 | 1218 | return -EINVAL; |
99e6c0e6 AV |
1219 | if (flags & TIMER_ABSTIME) |
1220 | rmtp = NULL; | |
edbeda46 | 1221 | current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE; |
99e6c0e6 | 1222 | current->restart_block.nanosleep.rmtp = rmtp; |
1da177e4 | 1223 | |
c0edd7c9 | 1224 | return kc->nsleep(which_clock, flags, &t); |
1da177e4 | 1225 | } |
1711ef38 | 1226 | |
b5793b0d DD |
1227 | #ifdef CONFIG_COMPAT_32BIT_TIME |
1228 | ||
8dabe724 AB |
1229 | SYSCALL_DEFINE4(clock_nanosleep_time32, clockid_t, which_clock, int, flags, |
1230 | struct old_timespec32 __user *, rqtp, | |
1231 | struct old_timespec32 __user *, rmtp) | |
1711ef38 | 1232 | { |
d3ba5a9a | 1233 | const struct k_clock *kc = clockid_to_kclock(which_clock); |
c0edd7c9 | 1234 | struct timespec64 t; |
59bd5bc2 | 1235 | |
edbeda46 | 1236 | if (!kc) |
59bd5bc2 | 1237 | return -EINVAL; |
edbeda46 | 1238 | if (!kc->nsleep) |
93cb8e20 | 1239 | return -EOPNOTSUPP; |
edbeda46 | 1240 | |
9afc5eee | 1241 | if (get_old_timespec32(&t, rqtp)) |
edbeda46 | 1242 | return -EFAULT; |
1711ef38 | 1243 | |
c0edd7c9 | 1244 | if (!timespec64_valid(&t)) |
edbeda46 AV |
1245 | return -EINVAL; |
1246 | if (flags & TIMER_ABSTIME) | |
1247 | rmtp = NULL; | |
1248 | current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE; | |
1249 | current->restart_block.nanosleep.compat_rmtp = rmtp; | |
1250 | ||
c0edd7c9 | 1251 | return kc->nsleep(which_clock, flags, &t); |
1711ef38 | 1252 | } |
b5793b0d | 1253 | |
edbeda46 | 1254 | #endif |
6631fa12 TG |
1255 | |
1256 | static const struct k_clock clock_realtime = { | |
eae1c4ae TG |
1257 | .clock_getres = posix_get_hrtimer_res, |
1258 | .clock_get = posix_clock_realtime_get, | |
1259 | .clock_set = posix_clock_realtime_set, | |
1260 | .clock_adj = posix_clock_realtime_adj, | |
1261 | .nsleep = common_nsleep, | |
eae1c4ae TG |
1262 | .timer_create = common_timer_create, |
1263 | .timer_set = common_timer_set, | |
1264 | .timer_get = common_timer_get, | |
1265 | .timer_del = common_timer_del, | |
1266 | .timer_rearm = common_hrtimer_rearm, | |
1267 | .timer_forward = common_hrtimer_forward, | |
1268 | .timer_remaining = common_hrtimer_remaining, | |
1269 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
ec8f954a | 1270 | .timer_wait_running = common_timer_wait_running, |
eae1c4ae | 1271 | .timer_arm = common_hrtimer_arm, |
6631fa12 TG |
1272 | }; |
1273 | ||
1274 | static const struct k_clock clock_monotonic = { | |
eae1c4ae TG |
1275 | .clock_getres = posix_get_hrtimer_res, |
1276 | .clock_get = posix_ktime_get_ts, | |
1277 | .nsleep = common_nsleep, | |
eae1c4ae TG |
1278 | .timer_create = common_timer_create, |
1279 | .timer_set = common_timer_set, | |
1280 | .timer_get = common_timer_get, | |
1281 | .timer_del = common_timer_del, | |
1282 | .timer_rearm = common_hrtimer_rearm, | |
1283 | .timer_forward = common_hrtimer_forward, | |
1284 | .timer_remaining = common_hrtimer_remaining, | |
1285 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
ec8f954a | 1286 | .timer_wait_running = common_timer_wait_running, |
eae1c4ae | 1287 | .timer_arm = common_hrtimer_arm, |
6631fa12 TG |
1288 | }; |
1289 | ||
1290 | static const struct k_clock clock_monotonic_raw = { | |
eae1c4ae TG |
1291 | .clock_getres = posix_get_hrtimer_res, |
1292 | .clock_get = posix_get_monotonic_raw, | |
6631fa12 TG |
1293 | }; |
1294 | ||
1295 | static const struct k_clock clock_realtime_coarse = { | |
eae1c4ae TG |
1296 | .clock_getres = posix_get_coarse_res, |
1297 | .clock_get = posix_get_realtime_coarse, | |
6631fa12 TG |
1298 | }; |
1299 | ||
1300 | static const struct k_clock clock_monotonic_coarse = { | |
eae1c4ae TG |
1301 | .clock_getres = posix_get_coarse_res, |
1302 | .clock_get = posix_get_monotonic_coarse, | |
6631fa12 TG |
1303 | }; |
1304 | ||
1305 | static const struct k_clock clock_tai = { | |
eae1c4ae TG |
1306 | .clock_getres = posix_get_hrtimer_res, |
1307 | .clock_get = posix_get_tai, | |
1308 | .nsleep = common_nsleep, | |
eae1c4ae TG |
1309 | .timer_create = common_timer_create, |
1310 | .timer_set = common_timer_set, | |
1311 | .timer_get = common_timer_get, | |
1312 | .timer_del = common_timer_del, | |
1313 | .timer_rearm = common_hrtimer_rearm, | |
1314 | .timer_forward = common_hrtimer_forward, | |
1315 | .timer_remaining = common_hrtimer_remaining, | |
1316 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
ec8f954a | 1317 | .timer_wait_running = common_timer_wait_running, |
eae1c4ae | 1318 | .timer_arm = common_hrtimer_arm, |
6631fa12 TG |
1319 | }; |
1320 | ||
a3ed0e43 | 1321 | static const struct k_clock clock_boottime = { |
eae1c4ae | 1322 | .clock_getres = posix_get_hrtimer_res, |
a3ed0e43 TG |
1323 | .clock_get = posix_get_boottime, |
1324 | .nsleep = common_nsleep, | |
1325 | .timer_create = common_timer_create, | |
1326 | .timer_set = common_timer_set, | |
1327 | .timer_get = common_timer_get, | |
1328 | .timer_del = common_timer_del, | |
1329 | .timer_rearm = common_hrtimer_rearm, | |
1330 | .timer_forward = common_hrtimer_forward, | |
1331 | .timer_remaining = common_hrtimer_remaining, | |
1332 | .timer_try_to_cancel = common_hrtimer_try_to_cancel, | |
ec8f954a | 1333 | .timer_wait_running = common_timer_wait_running, |
a3ed0e43 | 1334 | .timer_arm = common_hrtimer_arm, |
6631fa12 TG |
1335 | }; |
1336 | ||
1337 | static const struct k_clock * const posix_clocks[] = { | |
1338 | [CLOCK_REALTIME] = &clock_realtime, | |
1339 | [CLOCK_MONOTONIC] = &clock_monotonic, | |
1340 | [CLOCK_PROCESS_CPUTIME_ID] = &clock_process, | |
1341 | [CLOCK_THREAD_CPUTIME_ID] = &clock_thread, | |
1342 | [CLOCK_MONOTONIC_RAW] = &clock_monotonic_raw, | |
1343 | [CLOCK_REALTIME_COARSE] = &clock_realtime_coarse, | |
1344 | [CLOCK_MONOTONIC_COARSE] = &clock_monotonic_coarse, | |
a3ed0e43 | 1345 | [CLOCK_BOOTTIME] = &clock_boottime, |
6631fa12 TG |
1346 | [CLOCK_REALTIME_ALARM] = &alarm_clock, |
1347 | [CLOCK_BOOTTIME_ALARM] = &alarm_clock, | |
1348 | [CLOCK_TAI] = &clock_tai, | |
1349 | }; | |
1350 | ||
1351 | static const struct k_clock *clockid_to_kclock(const clockid_t id) | |
1352 | { | |
19b558db TG |
1353 | clockid_t idx = id; |
1354 | ||
1355 | if (id < 0) { | |
6631fa12 TG |
1356 | return (id & CLOCKFD_MASK) == CLOCKFD ? |
1357 | &clock_posix_dynamic : &clock_posix_cpu; | |
19b558db | 1358 | } |
6631fa12 | 1359 | |
19b558db | 1360 | if (id >= ARRAY_SIZE(posix_clocks)) |
6631fa12 | 1361 | return NULL; |
19b558db TG |
1362 | |
1363 | return posix_clocks[array_index_nospec(idx, ARRAY_SIZE(posix_clocks))]; | |
6631fa12 | 1364 | } |